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Fourqurean, James W.; Campbell, Justin E.; Rhoades, O. Kennedy; Munson, Calvin J.; Krause, Johannes R.; Altieri, Andrew H.; Douglass, James G.; Heck, Kenneth L.; Paul, Valerie J.; Armitage, Anna R.; Barry, Savanna C.; Bethel, Enrique; Christ, Lindsey; Christianen, Marjolijn J. A.; Dodillet, Grace; Dutton, Katrina; Frazer, Thomas K.; Gaffey, Bethany M.; Glazner, Rachael; Goeke, Janelle A.; Grana-Valdes, Rancel; Kramer, Olivier A. A.; Linhardt, Samantha T.; Martin, Charles W.; López, Isis Gabriela Martínez; McDonald, Ashley M.; Main, Vivienne A.; Manuel, Sarah A.; Marco-Méndez, Candela; O’Brien, Duncan A.; O’Shea, Owen; Patrick, Christopher J.; Peabody, Clare; Reynolds, Laura K.; Rodriguez, Alex; Bravo, Lucia M. Rodriguez; Sang, Amanda; Sawall, Yvonne; Smulders, Fee O. H.; Thompson, Jamie E.; van Tussenbroek, Brigitta; Wied, William L.; Wilson, Sara S.
Estuaries and coasts, 07/2023, Letnik: 46, Številka: 5Journal Article
The organic carbon (C org ) stored in seagrass meadows is globally significant and could be relevant in strategies to mitigate increasing CO 2 concentration in the atmosphere. Most of that stored C org is in the soils that underlie the seagrasses. We explored how seagrass and soil characteristics vary among seagrass meadows across the geographic range of turtlegrass ( Thalassia testudinum ) with a goal of illuminating the processes controlling soil organic carbon (C org ) storage spanning 23° of latitude. Seagrass abundance (percent cover, biomass, and canopy height) varied by over an order of magnitude across sites, and we found high variability in soil characteristics, with C org ranging from 0.08 to 12.59% dry weight. Seagrass abundance was a good predictor of the C org stocks in surficial soils, and the relative importance of seagrass-derived soil C org increased as abundance increased. These relationships suggest that first-order estimates of surficial soil C org stocks can be made by measuring seagrass abundance and applying a linear transfer function. The relative availability of the nutrients N and P to support plant growth was also correlated with soil C org stocks. Stocks were lower at N-limited sites than at P-limited ones, but the importance of seagrass-derived organic matter to soil C org stocks was not a function of nutrient limitation status. This finding seemed at odds with our observation that labile standard substrates decomposed more slowly at N-limited than at P-limited sites, since even though decomposition rates were 55% lower at N-limited sites, less C org was accumulating in the soils. The dependence of C org stocks and decomposition rates on nutrient availability suggests that eutrophication is likely to exert a strong influence on carbon storage in seagrass meadows.
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